via Pocket - American Trees Are Moving West, and No One Knows Why - Added May 18, 2017 at 09:57AM Climate change only explains at least 20 percent of the movement. As the consequences of climate change strike across the United States, ecologists have a guiding principle about how they think plants will respond.

Climate change only explains at least 20 percent of the movement. As the consequences of climate change strike across the United States, ecologists have a guiding principle about how they think plants will respond.

Climate change only explains at least 20 percent of the movement. As the consequences of climate change strike across the United States, ecologists have a guiding principle about how they think plants will respond.